I’m not sure if I’m grasping this wrong but it would be your choice how you do it. I would do both, there are no rules, you do what feels good to you. If you want to suck for a bit and then tease with licking and go back to sucking, then do that.
Remember this is for your enjoyment! Experiment with how you use pressure and your tongue. Here is a thread with different techniques in case you want to try something new 
Oral Sex Superbowl